<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        @keyframes blink { 50% { color: transparent } }

        .highlight {
            animation: 1s blink 3 steps(1);
            width: 150px;
            height: 30px;
        }
    </style>
</head>

<body>
    <div class="highlight"></div>
</body>

</html>